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For model Transmitter BC-375-(*), MILITARY U.S. (different makers for same model):This picture, from the Radio Service and Instruction Manual of the B-24 Airplane, shows a BC-375-D complete with one tuning unit

HF transmitter, AM/CW, 200 kHz to 12.5 MHz in several bands, according to the tuning unit plugged into. For frequency details see the entries of each tuning unit: TU-5, TU-6, TU-7, TU-8, TU-9, TU-10, TU-22, TU-26. 50 to 75W, depending upon the frequency band. Required the PE-73 dynamotor for HV supply. 28V version of BC-191.
The BC-375-(*) was generally used with its companion receiver BC-348 in several airplanes, such as B-17, B-24, B-25 and B-26. Part of SCR-287.